Measurement and Calculation

Express in scientific notation:

38,000

Express in scientific notation:

0.00000687

Convert 4800 g to kg (kilo = 10^3)

5600 dm to m (deci = 10^-1)

• 560

• 56

• 0.56

• 56000

Count the significant figures:

0.0000045

• 2

• 6

• 7

• 1

Write in 3 significant figures:

0.00040230

Round to 4 significant figures:

256.75 cm

• 2567

• 256.80

• 256.8

• 256.9

A 5-mL sample of water has a mass of 5 g. What is the density of water?

Mass = 24.47 g ; Volume = 13.2 mL

Calculate density in 4 significant figures

Variable changed by the chemist

• options

• variable

• independent variable

• control variable